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u need to find surface area which is 2(lw)+2(lh)+2(wh)
so is 2(30x54)+2(30x10)+2(54x10)= 2(1620)+2(300)+2(540)=
3240+600+1080=4920 square feet
divide the amount u need by the amount per gallon so is 4920/400 which is 12.3 gallons